I've got some personal loans I'd like to pay off and I was wondering if, starting in January, I could withdraw the full amount for the rest of the school year from my kids' 529 plans. I'd then use that money to pay off the loans while continuing to make the monthly payments I already have setup with the school (this is a religous high school, not college).

Is this allowed or do withdrawals have to match up 1 for 1 with payments?